/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePartyInterface.h
Get an attribute from the party data
true if the attribute was found
bool GetAttribute ( const [FString](API\Runtime\Core\Containers\FString) & AttrName, [FVariantData](API\Plugins\OnlineSubsystem\FVariantData) & OutAttrValue ) const